Infinity Reference 6822cf 6 x 8-Inch/5 x 7-Inch Two-Way Loudspeaker (Silver/Black)Single Unit. Plus One woofer cone technology gives improved bass response over convential speaker designs The Edge-driven textile-dome tweeter gives outstanding high frequency performance The speakers are designed to be driven with a 2 ohm amplifier or head unit This will give you improved bass response than a conventional 4 ohm speaker system ; the speakers can also operate at 4 ohms The speakers can be driven by a factory deck as wells as an aftermarket head unit Polypropylene Woofer Cone for improved bass output